Delta seal
[化] 三角密封
🧩 词语组成解析
delta
['deltə]
n. 希腊语字母表第四字母δ;（河流的）三角洲;[数]变量增量;
seal
[sil]
n. 密封;印章;海豹;封条;
v. 密封;盖章;决定;封上（信封）;
🗣️ 情景例句
I know you didn't expect to have me around,
我知道你没有预期我出现在你身边，
Why are you so happy?
你为什么这样快乐？
Where does Bill sit in the classrooom?
比尔坐在教室的那块儿？